<template>
	<view>
			<my-search @click="goSearch"></my-search>
		<view class="scroll-view-container" >
		
			<scroll-view scroll-y="true" class="left-scroll-view" :style="{ height: wh + 'px' }">
				<block v-for="(item, index) in cateList" :key="index">
					<!-- 处理激活类 -->
					<view @click="activeChange(index)" :class="['left-scroll-view-item', index === active ? 'active' : '`']">{{ item.cat_name }}</view>
				</block>
			</scroll-view>
			<!-- 右侧的滚动视图 -->
			<scroll-view scroll-y="true" class="right-scroll-view" :style="{ height: wh + 'px' }" :scroll-top="scrollTop">
				<view class="cate-lv2" v-for="(item, index) in cateLevel2" :key="index">
					<!-- 二级列表 -->
					<view class="cate-lv2-title">/{{ item.cat_name }}/</view>
					<!-- 三级列表 -->
					<view class="cate-lv3-list">
						<view class="cate-lv3-item" v-for="(item1, i1) in item.children" :key="i1" @click="goGoodsList(item1)">
							<image :src="item1.cat_icon"></image>
							<text>{{ item1.cat_name }}</text>
						</view>
					</view>
				</view>
			</scroll-view>
		</view>
	</view>
</template>

<script>
export default {
	data() {
		return {
			wh: 0,
			cateList: [],
			active: 0,
			cateLevel2: [],
			scrollTop: 0 // 切换一级分类 重置滚动条位置
		};
	},
	onLoad() {
		// 获取当前系统信息
		const sysInfo = uni.getSystemInfoSync();
		this.wh = sysInfo.windowHeight - 50;
		this.getCateList();
	},
	methods: {
		async getCateList() {
			const { data: res } = await uni.$http.get('/api/public/v1/categories');
			if (res.meta.status !== 200) {
				this.cateList = [];
				uni.$showMsg();
				return;
			}
			this.cateList = res.message;
			this.cateLevel2 = res.message[0].children;
		},
		activeChange(index) {
			this.active = index;
			this.cateLevel2 = this.cateList[index].children;
			this.scrollTop = this.scrollTop === 0 ? 1 : 0;
		},
		goGoodsList(item) {
			uni.navigateTo({
				url: '/subpkg/goods_list/goods_list?cid=' + item.cat_id
			});
		},
		goSearch(){
			console.log('search');
			uni.navigateTo({
				url:'/subpkg/search/search'
			})
		}
	}
};
</script>

<style lang="scss" scoped>
.scroll-view-container {
	display: flex;
	// margin: 10rpx;
	.right-scroll-view {
		.cate-lv2-title {
			font-size: 12px;
			font-weight: bold;
			text-align: center;
			padding: 15px 0;
		}
		.cate-lv3-list {
			display: flex;
			flex-wrap: wrap;
			.cate-lv3-item {
				width: 33.33%;
				margin-bottom: 10px;
				display: flex;
				flex-direction: column;
				// justify-content: center;
				align-items: center;
				image {
					width: 60px;
					height: 60px;
				}
				text {
					font-size: 12px;
				}
			}
		}
	}
	.left-scroll-view {
		width: 400rpx;
		.left-scroll-view-item {
			border-radius: 20rpx;
			margin: 10rpx;
			line-height: 60px;
			background-color: pink;
			text-align: center;
			font-size: 12px;
			// 一个元素既包含left-scroll-view-item  active  两个就是这样表达的
			&.active {
				background-color: yellow;
				position: relative;
				&::before {
					content: ' ';
					width: 3px;
					height: 30px;
					position: absolute;
					background-color: red;
					left: 0;
					top: 50%;
					transform: translateY(-50%);
				}
			}
		}
	}
}
</style>
